ExFAT drive won't mount

[spookybathtub]

I can't mount a USB 3 hard drive on either of my two macs. One is 10.7.5 and the other is 10.8.2. The drive is ExFAT formatted with a Master Boot Record (MBR). It mounts just fine on a Windows 7 PC, where it was formatted. I have another ExFAT MBR drive that works on all computers. Attached is a screenshot from Disk Utility, and this is what System Profiler says:

Capacity:	1.5 TB (1,500,301,909,504 bytes)
  Removable Media:	Yes
  Detachable Drive:	Yes
  BSD Name:	disk6
  Product ID:	0x2320
  Vendor ID:	0x0bc2  (Seagate LLC)
  Version:	 1.00
  Serial Number:	NA4G2DVT
  Speed:	Up to 480 Mb/sec
  Manufacturer:	Seagate
  Location ID:	0x05100000 / 2
  Current Available (mA):	500
  Current Required (mA):	36
  Partition Map Type:	MBR (Master Boot Record)
  S.M.A.R.T. status:	Not Supported
  Volumes:
Dickhute:
  Capacity:	1.5 TB (1,500,298,346,496 bytes)
  File System:	ExFAT
  BSD Name:	disk6s1
  Content:	Windows_NTFS
  Volume UUID:	239B8B0D-222B-3B50-B147-FAC9ABFAFECB

Anyone know how to fix this in Mac OS X? It's interesting that the Content descriptor is Windows_NTFS. The drive is a Seagate Expansion Portable.

 

[blueroom]

Format it using the Macs Disk Utility, single partition only.

 

[spookybathtub]

Thanks, but it's a bit too late for that, now that it's full of important data. Are you certain that OS X can only read ExFAT volumes which were formatted by a Mac, or is that just a guess?

 

[blueroom]

It sounds like some funky portioning.

FYI if the data's important you should have it backed up.

 

[Bear]

I wonder why it says "Content: Windows_NTFS"? Can you somehow check that the filesystem is pure ExFAT and didn't get modified somehow.

It shouldn't matter where it was formatted unless one of the formatting programs is buggy.

 

[spookybathtub]

Yeah that does seem weird. Any ideas on how to check that?

 

[blueroom]

Futzing around with the partition table can cause your data to vanish.

Back it up, reformat it using Disk Utility.